When a hopper is taking items from a trapped chest the number indicator of the item in the chest does not go down. When you go back into the chest the item number has decreased but is still stationary
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Duplicate of MC-6939 – If you searched the tracker before creating this report, and were unable to find the indicated ticket, please comment with the keywords you searched for so that the original report can be improved.
Are you saying hoppers don't work when trapped chests are open? Hoppers don't work unless they are not powered, and if you open a trapped chest next to a hopper, it prevents it from working, since trapped chests provide (a very small, but still prevents the hopper from working) redstone current.